CN110662047B - Image storage method and device, electronic equipment and computer storage medium - Google Patents
Image storage method and device, electronic equipment and computer storage medium Download PDFInfo
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- CN110662047B CN110662047B CN201910956997.0A CN201910956997A CN110662047B CN 110662047 B CN110662047 B CN 110662047B CN 201910956997 A CN201910956997 A CN 201910956997A CN 110662047 B CN110662047 B CN 110662047B
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
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- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
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Abstract
The invention relates to an image storage method and device, electronic equipment and a computer storage medium, wherein the image storage method comprises the following steps: grouping a plurality of images sequenced according to time to obtain a plurality of image groups; for each image group, selecting one image from the image group as a reference image of the image group; respectively calculating pixel difference values of pixels at corresponding positions of each image except the reference image in the image group and the reference image to obtain difference images corresponding to the images; and compressing and storing the reference image and the difference image of the image group. The image storage method of the embodiment of the invention has the advantages that the compression ratio of the image after AI processing is improved in a large range in a lossless manner, the storage efficiency of the storage space is further improved, and the pressure on the capacity of the storage space is reduced.
Description
Technical Field
The present invention relates to the field of image processing technologies, and in particular, to an image storage method and apparatus, an electronic device, and a computer storage medium.
Background
In security protection, the image after the AI processing needs to be stored for subsequent viewing, however, since the scene graph is stored in a full amount in the current security protection product, continuous image storage has a great pressure on the capacity of a storage space.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide an image storage method, which improves compression ratio of an AI-processed image in a large range without loss, thereby improving storage efficiency of a storage space and reducing pressure on capacity of the storage space.
Another object of the present invention is to provide an image storage apparatus for implementing the above image storage method.
In order to achieve the purpose, the invention adopts the following technical scheme:
an image storage method according to an embodiment of a first aspect of the present invention includes:
grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
for each image group, selecting one image from the image group as a reference image of the image group;
respectively calculating pixel difference values of pixels at corresponding positions of each image except the reference image in the image group and the reference image to obtain difference images corresponding to the images;
and compressing and storing the reference image and the difference image of the image group.
Preferably, grouping the plurality of temporally ordered images comprises:
images within a predetermined time period are grouped into one group.
Preferably, selecting one image from the image group as a reference image of the image group comprises:
and selecting a first image in the image group as a reference image.
Preferably, the image storage method further includes:
judging whether the image difference value between a plurality of continuous images in the image group and a reference image in the image group is larger than a preset threshold value or not,
and in the case that the judgment result is larger than the preset threshold value, taking the last image in the plurality of continuous images as a reference image of the next image group adjacent to the image group in terms of time.
An image storage apparatus according to an embodiment of a second aspect of the present invention includes:
the image grouping module is used for grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
the reference image selecting module is used for selecting one image from the image group as a reference image of the image group for each image group;
the differential image acquisition module is used for respectively calculating pixel difference values of pixels at corresponding positions of each image except the reference image in the image group and the reference image so as to obtain differential images corresponding to each image;
and the compression storage module is used for compressing and storing the reference image and the difference image of the image group.
Preferably, the image grouping module is further configured to group images within a predetermined time period.
Preferably, the reference image selecting module is further configured to select a first image in the image group as a reference image.
Preferably, the image storage device further includes a judging module, configured to judge whether image difference values between consecutive images in the image group and a reference image in the image group are all greater than a predetermined threshold, and if the image difference values are greater than the predetermined threshold, take a last image in the consecutive images as a reference image in a next image group temporally adjacent to the image group.
An electronic apparatus for image storage according to an embodiment of the third aspect of the present invention includes:
one or more processors;
one or more memories having computer readable code stored therein which, when executed by the one or more processors, performs the image storage method of any of the above embodiments.
A non-transitory computer storage medium according to a fourth aspect of the invention, has stored therein computer readable code that, when executed by one or more processors, performs the image storage method of any of the above embodiments.
The invention has the beneficial effects that:
the image is selected from each image group to serve as a reference image of the image group, the pixel difference value between each image except the reference image and the reference image is respectively calculated to obtain a difference image corresponding to each image, the reference image and the difference image of the image group are compressed and stored, and the adjacent images in the image group have small change, so that the compression ratio of the image is greatly and losslessly improved when the difference image of each image except the reference image is compressed and stored, the compression ratio of the image after AI processing is greatly and losslessly improved, the storage efficiency of a storage space is improved, and the pressure on the capacity of the storage space is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a flow chart of an image storage method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an image storage device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
It will be appreciated that as used herein, the term module may refer to or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and/or memory that executes one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality, or may be part of such hardware components.
It will be appreciated that in embodiments of the invention, the processor may be a microprocessor, a digital signal processor, a microcontroller, the like, and/or any combination thereof. According to another aspect, the processor may be a single-core processor, a multi-core processor, the like, and/or any combination thereof.
According to the image storage device of the embodiment of the invention, the image storage device groups a plurality of images sequenced according to time to obtain a plurality of image groups, selects a reference image of the image group in each image group, and compresses and stores the reference image and the differential image in the image groups according to the difference image of each image except the reference image in the image groups obtained by calculation.
For example, in a security product, video data collected by a certain path of fixedly installed camera is processed by AI to obtain a plurality of scene graphs including people, motor vehicles, non-motor vehicles and the like which are ordered according to time, and most regions in the scene graphs are less changed within a period of time, such as a daytime period. The image storage device groups a plurality of scene images which are obtained after AI processing and are ordered according to time to obtain a plurality of image groups, selects an image from each image group as a reference image of the image group, obtains a difference image of each image except the reference image from the image group according to calculation, and compresses and stores the reference image and the difference image in the image group.
The image storage device comprises an image grouping module 10, a reference image selecting module 20, a differential image acquiring module 30 and a compression storage module 40.
The image grouping module 10 is configured to group a plurality of images sorted according to time to obtain a plurality of image groups.
And a reference image selecting module 20, configured to select, for each image group, one image from the image group as a reference image of the image group.
A difference image obtaining module 30, configured to calculate pixel differences of pixels at corresponding positions of each image except the reference image in the image group and the reference image, respectively, to obtain difference images corresponding to the images.
And the compression storage module 40 is used for compressing and storing the reference image and the difference image of the image group.
The image storage device selects an image in each image group as a reference image of the image group, pixel difference values of the images except the reference image and the reference image are respectively calculated to obtain difference images corresponding to the images, and the reference image and the difference images of the image group are compressed and stored.
According to some embodiments of the present invention, the image grouping module 10 is further configured to group images within a predetermined time period. Most of the areas in the plurality of scene graphs sequenced according to time obtained after AI processing are basically kept unchanged in a period of time, and the images in a preset time period are divided into a group, so that the compression ratio of the differential images during compression storage is improved, the storage efficiency of a storage space is improved, and the pressure on the capacity of the storage space is reduced.
Preferably, the reference image selecting module 20 is further configured to select a first image in the image group as the reference image.
Further preferably, the image storage apparatus further comprises a judging module, which is configured to judge whether an image difference value between consecutive images in the image group and a reference image in the image group is greater than a predetermined threshold, and in a case that the image difference value is greater than the predetermined threshold, take a last image in the consecutive images as a reference image in a next image group temporally adjacent to the image group. The image difference may be a mean square error of pixel differences of pixels at corresponding positions of the two compared images, and of course, the image difference may also be another calculation method of pixel differences of pixels at corresponding positions of the two compared images. That is to say, when the image difference values between the consecutive images in the image group and the reference image in the image group are all greater than the predetermined threshold value, the last image in the consecutive images is used as the reference image of the next image group adjacent to the image group, so that the compression ratio of the images is greatly improved when the differential images in the image group are compressed and stored, and the storage efficiency of the storage space is further improved.
The image storage method based on the image storage device comprises the following steps:
step S1, grouping the images sorted according to time to obtain a plurality of image groups;
according to some embodiments of the invention, grouping the plurality of images in a chronological order comprises: images within a predetermined time period are grouped into one group.
Step S2, for each image group, selecting an image from the image group as a reference image of the image group;
preferably, selecting one image from the image group as a reference image of the image group comprises: and selecting a first image in the image group as a reference image.
Step S3, respectively calculating pixel difference values of pixels at corresponding positions of each image except for the reference image in the image group and the reference image, so as to obtain difference images corresponding to each image;
and step S4, compressing and storing the reference image and the difference image of the image group.
The image storage method has the advantages that one image is selected from each image group to serve as a reference image of the image group, the pixel difference value between each image except the reference image and the reference image is calculated respectively to obtain the difference image corresponding to each image, the reference image and the difference image of the image group are compressed and stored, and the adjacent images in the image group are small in change, so that the compression ratio of the images is improved in a largely lossless mode when the difference images of each image except the reference image are compressed and stored, the compression ratio of the images after AI processing is improved in a large range and in a lossless mode, the storage efficiency of a storage space is improved, and the pressure on the capacity of the storage space is reduced.
Further preferably, the image storage method further includes: step S5, determining whether an image difference between consecutive images in the image group and a reference image in the image group is greater than a predetermined threshold, where the image difference may be a mean square error of pixel differences of pixels at corresponding positions of the two compared images, and if the image difference is greater than the predetermined threshold, taking the last image in the consecutive images as a reference image of a next image group adjacent to the image group in time.
Based on the same inventive concept as the image storage method described above, the present application also provides an electronic device 1400, the electronic device 1400 comprising one or more processors 1401 and one or more memories 1402, the memories 1402 storing therein computer readable code,
wherein the computer readable code when executed by the one or more processors 1401 performs the steps of:
grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
preferably, grouping the plurality of images in a chronological order comprises: images within a predetermined time period are grouped into one group.
For each image group, selecting one image from the image group as a reference image of the image group;
preferably, selecting one image from the image group as a reference image of the image group comprises: and selecting a first image in the image group as a reference image.
Respectively calculating pixel difference values of pixels at corresponding positions of each image except for the reference image in the image group and the reference image to obtain differential images corresponding to each image;
and compressing and storing the reference image and the difference image of the image group.
Further, the electronic device 1400 further includes a network interface 1403, an input device 1404, a hard disk 1405, and a display device 1406.
The various interfaces and devices described above may be interconnected by a bus architecture. A bus architecture may be any architecture that may include any number of interconnected buses and bridges. One or more Central Processing Units (CPUs), represented in particular by processor 1401, and the various circuits of one or more memories 1402, represented by memory 1402, are coupled together. The bus architecture may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like. It will be appreciated that a bus architecture is used to enable communications among the components. The bus architecture includes a power bus, a control bus, and a status signal bus, in addition to a data bus, all of which are well known in the art and therefore will not be described in detail herein.
The network interface 1403 may be connected to a network (e.g., the internet, a local area network, etc.), obtain relevant data from the network, and store the data in the hard disk 1405.
An input device 1404 may receive various instructions input by an operator and send to processor 1401 for execution. The input devices 1404 may include a keyboard or pointing device (e.g., mouse, trackball, touch pad, touch screen, or the like).
The display device 1406 may display a result obtained by the processor 1401 executing the instruction.
The memory 1402 is used for storing programs and data necessary for the operation of the operating system 14021, and data such as intermediate results in the calculation process of the processor 1401.
It will be appreciated that the memory 1402 in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), or a flash memory, among others. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. The memory 1402 of the apparatus and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
In some embodiments, memory 1402 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof as follows: an operating system 14021 and application programs 14014.
The operating system 14021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks. The application 14014 includes various applications, such as a Browser (Browser), and the like, for implementing various application services. A program implementing the methods of embodiments of the present application may be included in application 14014.
The methods disclosed in the embodiments described above may be implemented in processor 1401, or by processor 1401. Processor 1401 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware integrated logic circuits or software in the processor 1401. The processor 1401 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, and may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1402, and the processor 1401 reads the information in the memory 1402, and implements the steps of the above method in combination with the hardware thereof.
It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For a hardware implementation, the processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.
Preferably, the computer readable code when executed by the one or more processors 1401 may also implement the steps of:
judging whether the image difference value between a plurality of continuous images in the image group and the reference image in the image group is larger than a preset threshold value or not,
and in the case that the judgment result is larger than the preset threshold value, taking the last image in the plurality of continuous images as a reference image of the next image group adjacent to the image group in terms of time. The image difference may be a mean square error of pixel differences of pixels at corresponding positions of the two images to be compared.
In the embodiment of the present application, the electronic device 1400 selects an image in each image group as a reference image of the image group, respectively calculates pixel differences between the images except the reference image and the reference image to obtain difference images corresponding to the images, and compresses and stores the reference image and the difference images of the image group, because adjacent images in the image group have small changes, the compression ratio of the image is greatly and losslessly improved when the difference images except the reference image are compressed and stored, so that the electronic device 1400 greatly and losslessly improves the compression ratio of the image after the AI processing, further improves the storage efficiency of the storage space, and reduces the pressure on the capacity of the storage space.
Additionally, embodiments of the present application also provide a non-transitory computer storage medium storing computer readable code that when executed by one or more processors performs the steps of:
grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
for each image group, selecting one image from the image group as a reference image of the image group;
respectively calculating pixel difference values of pixels at corresponding positions of each image except the reference image in the image group and the reference image to obtain difference images corresponding to the images;
and compressing and storing the reference image and the difference image of the image group.
When executed by a processor, the computer readable code implements the processes of the above-described embodiment of the image storage method, and can achieve the same technical effect, and in order to avoid repetition, detailed processes are not described again here. The computer storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. An image storage method, comprising:
grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
selecting one image as a reference image of the image group for each image group, wherein,
selecting a first image in the current image group as a reference image,
judging whether image difference values between a plurality of continuous images in the image group and a reference image in the image group are all larger than a preset threshold value,
under the condition that the judgment value is larger than the preset threshold value, taking the last image in the plurality of continuous images as a reference image of a next image group adjacent to the image group in terms of time;
respectively calculating pixel difference values of pixels at corresponding positions of each image except the reference image in the image group and the reference image to obtain difference images corresponding to the images;
and compressing and storing the reference image and the differential image of the image group.
2. The image storage method of claim 1, wherein grouping the plurality of images in a chronological order comprises:
images within a predetermined time period are grouped into one group.
3. An image storage apparatus, comprising:
the image grouping module is used for grouping a plurality of images sequenced according to time to obtain a plurality of image groups;
a reference image selecting module for selecting one image as a reference image of the image group for each image group,
selecting a first image in the current image group as a reference image,
judging whether image difference values between a plurality of continuous images in the image group and a reference image in the image group are all larger than a preset threshold value,
under the condition that the judgment is larger than the preset threshold value, taking the last image in the continuous images as a reference image of a next image group adjacent to the image group in terms of time;
a difference image obtaining module, configured to calculate pixel differences between each image in the image group except the reference image and pixels at a corresponding position of the reference image, respectively, so as to obtain a difference image corresponding to each image;
and the compression storage module is used for compressing and storing the reference image and the differential image of the image group.
4. The image storage device of claim 3, wherein the image grouping module is further configured to group images within a predetermined time period.
5. An electronic device for image storage, comprising:
one or more processors;
one or more memories having computer readable code stored therein which, when executed by the one or more processors, performs the image storage method of any of claims 1-2.
6. A non-transitory computer storage medium having stored therein computer readable code, which when executed by one or more processors performs the image storage method of any one of claims 1-2.
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| CN103797798A (en) * | 2011-09-01 | 2014-05-14 | 日本电气株式会社 | Captured image compression and transmission method and captured image compression and transmission system |
| CN106713913A (en) * | 2015-12-09 | 2017-05-24 | 腾讯科技（深圳）有限公司 | Video picture frame sending method and device and video picture frame receiving method and device |
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